java.util.Hashtable.isEmpty() 方法

package com.codingdict;

import java.util.*;

public class HashTableDemo {
   public static void main(String args[]) {

      // create hash table
      Hashtable htable1 = new Hashtable();      

      // put values in table
      htable1.put(1, "A");
      htable1.put(2, "B");
      htable1.put(3, "C");
      htable1.put(4, "D");

      // check if table is empty
      System.out.println("Is hash table empty :"+htable1.isEmpty());
   }    
}